1# Feature Specification: Native WebKit Browser Backend
2
3**Feature Branch**: `003-webkit2gtk-migration`  
4**Created**: 2025-01-21  
5**Status**: Draft  
6**Input**: User description: "I want to ditch Wails and use Webkit2Gtk directly and create my own C go bindings"
7
8## Execution Flow (main)
9```
101. Parse user description from Input
11   → If empty: ERROR "No feature description provided"
122. Extract key concepts from description
13   → Identify: actors, actions, data, constraints
143. For each unclear aspect:
15   → Mark with [NEEDS CLARIFICATION: specific question]
164. Fill User Scenarios & Testing section
17   → If no clear user flow: ERROR "Cannot determine user scenarios"
185. Generate Functional Requirements
19   → Each requirement must be testable
20   → Mark ambiguous requirements
216. Identify Key Entities (if data involved)
227. Run Review Checklist
23   → If any [NEEDS CLARIFICATION]: WARN "Spec has uncertainties"
24   → If implementation details found: ERROR "Remove tech details"
258. Return: SUCCESS (spec ready for planning)
26```
27
28---
29
30## ⚡ Quick Guidelines
31- ✅ Focus on WHAT users need and WHY
32- ❌ Avoid HOW to implement (no tech stack, APIs, code structure)
33- 👥 Written for business stakeholders, not developers
34
35### Section Requirements
36- **Mandatory sections**: Must be completed for every feature
37- **Optional sections**: Include only when relevant to the feature
38- When a section doesn't apply, remove it entirely (don't leave as "N/A")
39
40### For AI Generation
41When creating this spec from a user prompt:
421. **Mark all ambiguities**: Use [NEEDS CLARIFICATION: specific question] for any assumption you'd need to make
432. **Don't guess**: If the prompt doesn't specify something (e.g., "login system" without auth method), mark it
443. **Think like a tester**: Every vague requirement should fail the "testable and unambiguous" checklist item
454. **Common underspecified areas**:
46   - User types and permissions
47   - Data retention/deletion policies  
48   - Performance targets and scale
49   - Error handling behaviors
50   - Integration requirements
51   - Security/compliance needs
52
53---
54
55## User Scenarios & Testing *(mandatory)*
56
57### Primary User Story
58As a developer/power user of the dumb browser application, I need the browser to have full control over its web rendering engine and browser capabilities without being limited by third-party frameworks, so that I can customize browser behavior, optimize performance, and maintain direct access to all native browser features.
59
60### Acceptance Scenarios
611. **Given** the current browser uses a third-party framework, **When** I replace it with a native solution, **Then** the browser maintains all existing functionality (navigation, zoom, keyboard controls, history)
622. **Given** the native browser backend is implemented, **When** I want to add custom browser features, **Then** I can directly access and modify browser engine capabilities without framework limitations
633. **Given** the browser is running with the native backend, **When** users interact with web pages, **Then** performance is equal to or better than the previous framework-based implementation
644. **Given** the native backend is active, **When** the browser encounters different web content types, **Then** all standard web technologies render correctly
65
66### Edge Cases
67- What happens when the native bindings fail to load or initialize?
68- How does the system handle web pages that stress-test browser engine capabilities?
69- What occurs if the browser needs to interface with system-level features not exposed by the native bindings?
70
71## Requirements *(mandatory)*
72
73### Functional Requirements
74- **FR-001**: System MUST render web pages with full HTML5, CSS3, and JavaScript support equivalent to modern browsers
75- **FR-002**: System MUST maintain all existing browser controls (navigation, zoom, keyboard shortcuts) without regression
76- **FR-003**: System MUST preserve existing user data (history, bookmarks, zoom settings) during migration
77- **FR-004**: System MUST support the same web content types and media formats as the current implementation
78- **FR-005**: System MUST provide identical or improved page loading performance compared to current framework
79- **FR-006**: System MUST maintain cross-platform compatibility [NEEDS CLARIFICATION: which platforms need to be supported - Linux only, or multiple platforms?]
80- **FR-007**: System MUST handle browser crashes gracefully without data loss
81- **FR-008**: System MUST support developer tools and debugging capabilities for web content
82- **FR-009**: System MUST maintain security features like sandboxing and content security policies
83- **FR-010**: System MUST provide memory management equivalent to or better than current implementation
84
85### Key Entities
86- **Browser Engine Interface**: The abstraction layer that handles web content rendering, JavaScript execution, and browser feature access
87- **Native Bindings**: The interface components that connect high-level application code with low-level browser engine capabilities
88- **Migration State**: Configuration and data preservation mechanisms that ensure seamless transition from old to new backend
89
90---
91
92## Review & Acceptance Checklist
93*GATE: Automated checks run during main() execution*
94
95### Content Quality
96- [ ] No implementation details (languages, frameworks, APIs)
97- [ ] Focused on user value and business needs
98- [ ] Written for non-technical stakeholders
99- [ ] All mandatory sections completed
100
101### Requirement Completeness
102- [ ] No [NEEDS CLARIFICATION] markers remain
103- [ ] Requirements are testable and unambiguous  
104- [ ] Success criteria are measurable
105- [ ] Scope is clearly bounded
106- [ ] Dependencies and assumptions identified
107
108---
109
110## Execution Status
111*Updated by main() during processing*
112
113- [x] User description parsed
114- [x] Key concepts extracted
115- [x] Ambiguities marked
116- [x] User scenarios defined
117- [x] Requirements generated
118- [x] Entities identified
119- [ ] Review checklist passed
120
121---